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Structural aspects of akinete germination in the cyanobacterium Anabaena variabilis
Authors:Wolfram Braune
Affiliation:(1) Sektion Biologie der Friedrich-Schiller-Universität Jena, Wissenschaftsbereich Pflanzenphysiologie, DDR-69 Jena, German Democratic Republic
Abstract:Electronmicroscopical investigations of light activated akinetes in different phases before outgrowth of the germinating cell showed two alterations in the akinete envelope, obviously in connection with the germination process. After induction of germination the akinetes show formation of an expanding more or less electron dense layer between the outer cell wall layer (outer membrane, LIV) and the condensed part of the akinete coat (the transformed sheath of the vegetative cell). Between this new formed layer and the mentioned part of the akinete coat thick ldquolaminar layersrdquo are deposited which contain alternately electron dense and electron transparent strata. The expanding layer is assumed to be a mucous layer which acts as swelling body causing, after bursting of the layered shell, the expulsion of the germinating cell in the manner characteristic for Anabaena variabilis.
Keywords:Anabaena  Akmetes  Germination  Envelope structure
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